It can also be used in a comparative sense, meaning smaller than all others.
Here are some examples:
* "The least expensive option" - the option with the lowest price.
* "She had the least amount of time to prepare" - she had less time to prepare than anyone else.
* "The least common denominator" - the smallest number that is divisible by all the numbers in a set.
* "He had the least amount of patience" - he was less patient than anyone else.
Essentially, "least" always implies the smallest or lowest value within a given context.